We have seen this alert appear after a major power outage. If you are running multi user and upon launch the client application states "Not enough stack space" follow the steps below.

On the offending client machine:

Start up the client holding the shift key You will get a dialog to Connect to 4D server. Select SuccessWare in the Recent On the TCP/IP Tab there is a check box to "Force local Resources" Check that box. Click ok and see if you get the same result from that system.